Puzzle Nekst 2013 1

After a long summer, keeping up your social life, relaxing and lying in the sun, it is again time to flex you brains. For this purpose Nekst provides you with a puzzle about obtaining a free ticket to the cinema. So grab a pen and paper and enjoy yourself with solving this puzzle.In front of a local cinema a lot of people are waiting until the ticket office opens. As soon as the ticket office opens, the manager announces a special promotion. The first customer in the line who has the same birthday as a customer who has bought a ticket before him will get his ticket for free. He will, however, only give one customer a free ticket by means of this promotion.
Suppose you can decide, by moving smart, on which position in the line you will be at the start. The question is to determine the optimal spot to choose, when trying to maximize your chance of getting a free ticket.Please send your solution to Nekst@Asset-Econometrics.nl before the 29th of November. A crate of beer or a delicious pie, whichever the winner prefers, will be waiting for whoever has the best (partial) solution. Please note that as before, every recipient of this magazine is eligible to send in their solution, so members of the department are invited to participate as well. Good luck!Lars van Heijst is the winner of the previous puzzle. As a reward, he can come and pick up a crate of beer or a pie at room E1.10. The solution of the previous puzzle was EDACB.